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annotate libervia/backend/tools/common/regex.py @ 4118:07370d2a9bde

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plugin XEP-0167: keep media order when starting a call: media content order is relevant when building Jingle contents/SDP notably for bundling. This patch fixes the previous behaviour of always using the same order by keeping the order of the data (i.e. order of original SDP offer). Previous behaviour could lead to call failure. rel 424
author Goffi <goffi@goffi.org>
date Tue, 03 Oct 2023 15:15:24 +0200
parents 4b842c1fb686
children 0d7bb4df2343
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python3
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2
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3
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4 # Salut à Toi: an XMPP client
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """ regex tools common to backend and frontends """
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21
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22 import re
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23 import unicodedata
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25 path_escape = {"%": "%25", "/": "%2F", "\\": "%5c"}
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26 path_escape_rev = {re.escape(v): k for k, v in path_escape.items()}
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27 path_escape = {re.escape(k): v for k, v in path_escape.items()}
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28 #  thanks to Martijn Pieters (https://stackoverflow.com/a/14693789)
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29 RE_ANSI_REMOVE = re.compile(r'\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])')
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30 RE_TEXT_URL = re.compile(r'[^a-zA-Z0-9,_]+')
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31 TEXT_MAX_LEN = 60
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32 # min lenght is currently deactivated
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33 TEXT_WORD_MIN_LENGHT = 0
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35
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36 def re_join(exps):
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37 """Join (OR) various regexes"""
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38 return re.compile("|".join(exps))
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41 def re_sub_dict(pattern, repl_dict, string):
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42 """Replace key, value found in dict according to pattern
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43
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44 @param pattern(basestr): pattern using keys found in repl_dict
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45 @repl_dict(dict): keys found in this dict will be replaced by
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46 corresponding values
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47 @param string(basestr): string to use for the replacement
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48 """
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49 return pattern.sub(lambda m: repl_dict[re.escape(m.group(0))], string)
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51
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52 path_escape_re = re_join(list(path_escape.keys()))
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53 path_escape_rev_re = re_join(list(path_escape_rev.keys()))
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55
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56 def path_escape(string):
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57 """Escape string so it can be use in a file path
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59 @param string(basestr): string to escape
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60 @return (str, unicode): escaped string, usable in a file path
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61 """
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62 return re_sub_dict(path_escape_re, path_escape, string)
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65 def path_unescape(string):
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66 """Unescape string from value found in file path
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68 @param string(basestr): string found in file path
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69 @return (str, unicode): unescaped string
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70 """
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71 return re_sub_dict(path_escape_rev_re, path_escape_rev, string)
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74 def ansi_remove(string):
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75 """Remove ANSI escape codes from string
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77 @param string(basestr): string to filter
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78 @return (str, unicode): string without ANSI escape codes
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79 """
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80 return RE_ANSI_REMOVE.sub("", string)
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82
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83 def url_friendly_text(text):
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84 """Convert text to url-friendly one"""
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85 # we change special chars to ascii one,
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86 # trick found at https://stackoverflow.com/a/3194567
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87 text = unicodedata.normalize('NFD', text).encode('ascii', 'ignore').decode('utf-8')
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88 text = RE_TEXT_URL.sub(' ', text).lower()
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89 text = '-'.join([t for t in text.split() if t and len(t)>=TEXT_WORD_MIN_LENGHT])
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90 while len(text) > TEXT_MAX_LEN:
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91 if '-' in text:
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92 text = text.rsplit('-', 1)[0]
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93 else:
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94 text = text[:TEXT_MAX_LEN]
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95 return text